Extron electronics IP Link Series User Manual page 50

URL encoding
URL (Universal Resource Locator) encoding is the method of using ASCII hexadecimal
characters to display specific characters in a URL. It is used for several reasons. On some
operating systems, certain characters are unsafe or not available, and others are reserved
by the HTML or URL specification. URL encoding is used to insure compatibility and
functionality with most Internet browsers. As a general rule, use the hexadecimal encoding
method shown below when these characters appear in your URLs.
The following types of characters do not require encoding in a URL:
Characters that Do Not Require Encoding
Alphanumeric characters
Special characters
Reserved characters
Reserved characters
Reserved characters should not be encoded when they appear in their conventional
meaning in a URL. For example, do not encode the slash (/) when using it as part of the
URL syntax. Only encode unsafe characters (defined in the table in the next section) in your
URLs.
The following table lists reserved characters.
Character
Dollar
$
Ampersand
&
Plus
+
Comma
,
Forward slash or virgule
/
Colon
:
Equal
=
Question mark
?
"At" symbol
@
Unsafe characters
URLs use some characters for "special use" in defining their syntax and these characters
should be encoded. For various reasons, these characters may possibly be misunderstood
within a URL.
The following table lists unsafe characters.
Character
Space
Quotation marks
" "
"Less than" symbol
<
"Greater than" symbol
>
Pound
#
Percent
%
, ,
0-9 a-z A-Z
$ _ - . + ! * ( ) ,
; / ? : @ = &
NOTE: When used for their reserved purposes, these
characters do not require encoding within a URL.
Hexadecimal Decimal
24 36
26 38
2B 43
2C 44
2F 47
3B 59
3D 61
3F 63
40 64
Hexadecimal Decimal
20 32
22 34
3C 60
3E 62
23 35
25 37
IPL T PC1 • HTML Configuration and Control 42